I have a VW bus T3 with turbodiesel. Somewhere I have heard that you should let the engine run after the shutdown in order to cool down the turbocharger. What does that look like, it is necessary, and what happens if you don’t do it. Grad if you stop often it is a bit annoying. If someone knows that, is it also necessary for modern cars with diesel (renault) or are there technical measures that take it away from you?